there are 4 pins top->down 5v?,TX,RX,GND. connecting these pins to a max232 level converter and then to a serial port on a computer allows you to view the bootloader start up processes and the starting of the linux kernel.

+

the serial port header has the follow pinout from top to bottom:

+

+

{|border=1

+

!Number

+

!Description

+

|-

+

|1

+

|5V

+

|-

+

|2

+

|TX

+

|-

+

|3

+

|RX

+

|-

+

|4

+

|GND

+

|}

+

+

The UART TX and RX signals are at +3.3v TTL level which requires a [[RS232_Level_Shifter]] if connecting to a standard RS-232 interface or to a standard USB-to-RS232 adapter. A wide range of USB-to-TTLUART adapters are available including the following:

One of the simplest way to connect your PC to the Literati serial port is to order a [http://www.dealextreme.com/p/data-cable-compatible-with-nokia-ca-42-446 Nokia CA-42 Data Cable] from [http://www.dealextreme.com DealExtreme]. When you receive it, you can cut it open to find 3 or 4 wires depending on the revision. If you have three wires, then you will find GND, RX, and TX. If you have four wires, then the fourth wire is +3.3V. The example CA-42 only has three. The cable can be soldered to a female pin header so it can connect to the male pins used to expose the serial port to the outside.

Latest revision as of 03:44, 28 October 2011

Contents

Location

The Serial port on the White literati model #1637287 is located on the right side of the device seen in the picture on the right.
this is also true on the older black models.

currently we do not know where they are on the newer models a picture of a newer model is also on the right and circled is what is believed to be the serial port.

White Model new

the serial port header has the follow pinout from top to bottom:

Number

Description

1

5V

2

TX

3

RX

4

GND

The UART TX and RX signals are at +3.3v TTL level which requires a RS232_Level_Shifter if connecting to a standard RS-232 interface or to a standard USB-to-RS232 adapter. A wide range of USB-to-TTLUART adapters are available including the following:

Once connected this will enable access the bootloader and start up processes of the linux kernel.

Easy Serial Port Access

View of the serial port access

Serial port with back on

Serial cable connected

Use the following items to expose the serial port in a handy way that does not require reopening of the literati to access the serial port:

a bit of ribbon cable

male header pins

female socket

another option includes the use of a 1/8" audio jack which can be easily mounted by drilling a hole in the back cover.

Using CA-42 Serial Cable

CA-42 USB Serial Cable

CA-42 Pinout

CA-42 Cut Open

One of the simplest way to connect your PC to the Literati serial port is to order a Nokia CA-42 Data Cable from DealExtreme. When you receive it, you can cut it open to find 3 or 4 wires depending on the revision. If you have three wires, then you will find GND, RX, and TX. If you have four wires, then the fourth wire is +3.3V. The example CA-42 only has three. The cable can be soldered to a female pin header so it can connect to the male pins used to expose the serial port to the outside.

Boot Loader

during the boot process there is a 3 second count down to allow a user to enter the bootloader before booting the kernel.

To get out of the bootloader right now you type "reset" and the device will reboot allowing you to get out of the bootcmd line
there is a way to boot from nand but iv forgot to log the offsets.